The rest of this post is now obsolete, but retained for archival purposes.

=====================Characters: U+2018 and U+2019The current vertical orientation in the draft UTR #50: TThe vertical orientation that I recommend: SB

As far as I think, from viewpoints of Japanese typography, the vertical orientation of the single quotation characters U+2018 and U+2019 should be SB, for the reason mentioned below:

JIS X 4051 assigns vertical-specific glyph shapes only to the single quotation marks (U+2018 and U+2019), while no vertical-specific glyphs are given to the double quotation marks (U+201C and 201D). This inconsistency should not be brought into the vertical orientations that the UTR #50 is to define. It is thought that one of the causes for this inconsistency is that JIS X 0213:2000 listed a glyph shape pair that seemed to be usable as the single quotes' vertical glyphs. JLREQ seems to have simply inherited it. However, there are different conventions in what glyphs in what posture should be used for the single quotes composed in the vertical writing mode. For instance, serious editors, book typographers or printing historians often argue that the horizontal Western quotes should correspond to the standard vertical Japanese quotes if used in vertical lines. But if so, such conversion is beyond the scope of the relevant issue to be handled by the UTR #50, and writers and editors should input the Japanese quotation characters directly, instead of using the Western single quotes.

=====================3030 is currently U and should be T instead. Just like 301C, it rotates/mirrors.

=====================Currently, the small hiragana and katakana characters are in single class, cl-11, smallKana. The proposal is to create two subclasses, one for hiragana (cl-11.1, smallHiragana) and one for katakana (cl-11.1, smallKatakana), and to change:

- the other characters currently in cl-11, smallKana, to cl-11.2, smallKatakana.

=====================In table 3, the comment "mirroring, not just rotation" for 30FC is misleading. The change of shape is rooted in the calligraphy of this character and "mirroring" does not do justice to that. There is a more appropriate description in JLREQ.

With that in mind, the consensus is to simply remove the "comment" column from table 3.

=====================The normative status of UTR#50 is not clearly defined. The consensus is to add this paragraph at the end of section 1:

--The properties and algorithms presented in this report are informative. The intent is to provide a reasonable determination of the spacing and orientation of characters in Japanese texts, which can be used in the absence of other information, but can be overridden by the context, such as markup in a document or preferences in a layout application. This determination is based on the most common use of a character, but in no way implies that that character is used only in that way.

--A possible approach is to start with the legacy grapheme clusters or extended grapheme clusters as defined in [UAX29]. The spacing class and orientation for a grapheme cluster as a whole is then determined by taking the spacing class and orientation of the first character in the cluster, with the following exceptions:

digits are typeset sideways by default commonly used variable names (Latin, Greek) are typeset sideways by default we expect superscripts and subscripts to typeset sideways by default arrows, which function as relations in math, would also be typeset sideways by default (see separate comment) ASCII math symbols are expected to typeset sideways mathematical formulae are usually typeset sideways even in vertical text the most commonly-used symbols that are intermixed with prose (× and +) are symmetric wrt rotation, and the equals sign (=) seems to be typeset sideways even when everything else is upright [4]

we suggest math symbols should be typeset sideways by default.

When intermixed in prose, variable names are often typeset upright, and in such styles math symbols might also be typeset upright. However in these situations some tailoring is necessary for the variable names whatever the mathematical default, so using this style to determine the default rules in plaintext does not make sense.

The default orientation of fullwidth math symbols is less clear, since fullwidth characters typically provide an orientation contrast with their ASCII counterparts; perhaps they should be U (or T for equals).

=====================The small kana characters should have orientation T (rather than TK) because the transformation is necessary: they are aligned on their bottom side in horizontal lines, and on their right side in vertical lines. The property value TK can be removed.

=====================The Yijing Hexagram Symbols (4DC0..4DFF) should be treated as symbols. The data file should be changed to:

4DC0 .. 4DFF ; cl-19.3, symbol ; U

=====================The Small Form Variants (FE50..FE6F) should be treated like their fullwidth counterparts. The data file should be changed to:

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